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<div class="section" id="module-md5">
<span id="md5-md5-message-digest-algorithm"></span><h1>14.3. <a class="reference internal" href="#module-md5" title="md5: RSA's MD5 message digest algorithm. (deprecated)"><tt class="xref py py-mod docutils literal"><span class="pre">md5</span></tt></a> — MD5 message digest algorithm<a class="headerlink" href="#module-md5" title="Permalink to this headline">¶</a></h1>
<p class="deprecated">
<span class="versionmodified">Deprecated since version 2.5: </span>Use the <a class="reference internal" href="hashlib.html#module-hashlib" title="hashlib: Secure hash and message digest algorithms."><tt class="xref py py-mod docutils literal"><span class="pre">hashlib</span></tt></a> module instead.</p>
<p id="index-0">This module implements the interface to RSA’s MD5 message digest algorithm (see
also Internet <span class="target" id="index-1"></span><a class="rfc reference external" href="http://tools.ietf.org/html/rfc1321.html"><strong>RFC 1321</strong></a>). Its use is quite straightforward: use <a class="reference internal" href="new.html#module-new" title="new: Interface to the creation of runtime implementation objects. (deprecated)"><tt class="xref py py-func docutils literal"><span class="pre">new()</span></tt></a>
to create an md5 object. You can now feed this object with arbitrary strings
using the <tt class="xref py py-meth docutils literal"><span class="pre">update()</span></tt> method, and at any point you can ask it for the
<em class="dfn">digest</em> (a strong kind of 128-bit checksum, a.k.a. “fingerprint”) of the
concatenation of the strings fed to it so far using the <tt class="xref py py-meth docutils literal"><span class="pre">digest()</span></tt> method.</p>
<p>For example, to obtain the digest of the string <tt class="docutils literal"><span class="pre">'Nobody</span> <span class="pre">inspects</span> <span class="pre">the</span> <span class="pre">spammish</span>
<span class="pre">repetition'</span></tt>:</p>
<div class="highlight-python"><div class="highlight"><pre><span class="gp">>>> </span><span class="kn">import</span> <span class="nn">md5</span>
<span class="gp">>>> </span><span class="n">m</span> <span class="o">=</span> <span class="n">md5</span><span class="o">.</span><span class="n">new</span><span class="p">()</span>
<span class="gp">>>> </span><span class="n">m</span><span class="o">.</span><span class="n">update</span><span class="p">(</span><span class="s">"Nobody inspects"</span><span class="p">)</span>
<span class="gp">>>> </span><span class="n">m</span><span class="o">.</span><span class="n">update</span><span class="p">(</span><span class="s">" the spammish repetition"</span><span class="p">)</span>
<span class="gp">>>> </span><span class="n">m</span><span class="o">.</span><span class="n">digest</span><span class="p">()</span>
<span class="go">'\xbbd\x9c\x83\xdd\x1e\xa5\xc9\xd9\xde\xc9\xa1\x8d\xf0\xff\xe9'</span>
</pre></div>
</div>
<p>More condensed:</p>
<div class="highlight-python"><div class="highlight"><pre><span class="gp">>>> </span><span class="n">md5</span><span class="o">.</span><span class="n">new</span><span class="p">(</span><span class="s">"Nobody inspects the spammish repetition"</span><span class="p">)</span><span class="o">.</span><span class="n">digest</span><span class="p">()</span>
<span class="go">'\xbbd\x9c\x83\xdd\x1e\xa5\xc9\xd9\xde\xc9\xa1\x8d\xf0\xff\xe9'</span>
</pre></div>
</div>
<p>The following values are provided as constants in the module and as attributes
of the md5 objects returned by <a class="reference internal" href="new.html#module-new" title="new: Interface to the creation of runtime implementation objects. (deprecated)"><tt class="xref py py-func docutils literal"><span class="pre">new()</span></tt></a>:</p>
<dl class="data">
<dt id="md5.digest_size">
<tt class="descclassname">md5.</tt><tt class="descname">digest_size</tt><a class="headerlink" href="#md5.digest_size" title="Permalink to this definition">¶</a></dt>
<dd><p>The size of the resulting digest in bytes. This is always <tt class="docutils literal"><span class="pre">16</span></tt>.</p>
</dd></dl>
<p>The md5 module provides the following functions:</p>
<dl class="function">
<dt id="md5.new">
<tt class="descclassname">md5.</tt><tt class="descname">new</tt><big>(</big><span class="optional">[</span><em>arg</em><span class="optional">]</span><big>)</big><a class="headerlink" href="#md5.new" title="Permalink to this definition">¶</a></dt>
<dd><p>Return a new md5 object. If <em>arg</em> is present, the method call <tt class="docutils literal"><span class="pre">update(arg)</span></tt>
is made.</p>
</dd></dl>
<dl class="function">
<dt id="md5.md5">
<tt class="descclassname">md5.</tt><tt class="descname">md5</tt><big>(</big><span class="optional">[</span><em>arg</em><span class="optional">]</span><big>)</big><a class="headerlink" href="#md5.md5" title="Permalink to this definition">¶</a></dt>
<dd><p>For backward compatibility reasons, this is an alternative name for the
<a class="reference internal" href="new.html#module-new" title="new: Interface to the creation of runtime implementation objects. (deprecated)"><tt class="xref py py-func docutils literal"><span class="pre">new()</span></tt></a> function.</p>
</dd></dl>
<p>An md5 object has the following methods:</p>
<dl class="method">
<dt id="md5.md5.update">
<tt class="descclassname">md5.</tt><tt class="descname">update</tt><big>(</big><em>arg</em><big>)</big><a class="headerlink" href="#md5.md5.update" title="Permalink to this definition">¶</a></dt>
<dd><p>Update the md5 object with the string <em>arg</em>. Repeated calls are equivalent to a
single call with the concatenation of all the arguments: <tt class="docutils literal"><span class="pre">m.update(a);</span>
<span class="pre">m.update(b)</span></tt> is equivalent to <tt class="docutils literal"><span class="pre">m.update(a+b)</span></tt>.</p>
</dd></dl>
<dl class="method">
<dt id="md5.md5.digest">
<tt class="descclassname">md5.</tt><tt class="descname">digest</tt><big>(</big><big>)</big><a class="headerlink" href="#md5.md5.digest" title="Permalink to this definition">¶</a></dt>
<dd><p>Return the digest of the strings passed to the <a class="reference internal" href="#md5.md5.update" title="md5.md5.update"><tt class="xref py py-meth docutils literal"><span class="pre">update()</span></tt></a> method so far.
This is a 16-byte string which may contain non-ASCII characters, including null
bytes.</p>
</dd></dl>
<dl class="method">
<dt id="md5.md5.hexdigest">
<tt class="descclassname">md5.</tt><tt class="descname">hexdigest</tt><big>(</big><big>)</big><a class="headerlink" href="#md5.md5.hexdigest" title="Permalink to this definition">¶</a></dt>
<dd><p>Like <a class="reference internal" href="#md5.md5.digest" title="md5.md5.digest"><tt class="xref py py-meth docutils literal"><span class="pre">digest()</span></tt></a> except the digest is returned as a string of length 32,
containing only hexadecimal digits. This may be used to exchange the value
safely in email or other non-binary environments.</p>
</dd></dl>
<dl class="method">
<dt id="md5.md5.copy">
<tt class="descclassname">md5.</tt><tt class="descname">copy</tt><big>(</big><big>)</big><a class="headerlink" href="#md5.md5.copy" title="Permalink to this definition">¶</a></dt>
<dd><p>Return a copy (“clone”) of the md5 object. This can be used to efficiently
compute the digests of strings that share a common initial substring.</p>
</dd></dl>
<div class="admonition-see-also admonition seealso">
<p class="first admonition-title">See also</p>
<dl class="last docutils">
<dt>Module <a class="reference internal" href="sha.html#module-sha" title="sha: NIST's secure hash algorithm, SHA. (deprecated)"><tt class="xref py py-mod docutils literal"><span class="pre">sha</span></tt></a></dt>
<dd>Similar module implementing the Secure Hash Algorithm (SHA). The SHA algorithm
is considered a more secure hash.</dd>
</dl>
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